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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd55c625cb0a6fad86b31244d20333067a237717c7e6c3ffd0fa5ded8e04e89b' 
  AND token = 'Za0Ib82R/rz1sS81/lICSNIa1PehF6FFVgqqd5z6FSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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