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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8ffbe665890a7a8851f3b40e75aba34ae5905c1c2cc30cb4847bbd427db2c6' 
  AND token = 'n1P5OZ1d/9gx2wJiUBH/i/3S9si0pz6+HBjQMvkb7J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}