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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5684e55c0d0ca058adfd42a31185190f7df4c34c8985211180c2623f71de994' 
  AND token = 'LcnmNNmuvrE3Ud4pM9vULzSglXvvfjyCATUOX5p697o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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