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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a63bd19f7e9d51abd302c4ad47c90896cc7c88382158cb58af3a9371a02834' 
  AND token = 'rcIcZrP2vE4Jlh1Y4xf35zYE7RulGgRfBp29c/pXIFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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