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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85c73bbb94f82b2d099dd815e55ff0beb066913c5e205d32c6fe7c8d6d822dd' 
  AND token = 'SR3ZLhM5l1S7kfMTxQivty1Fa4GSSuJPXu9VwmYCK9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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