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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae352ac89ffd1bcc5f4b056b0f1a618f41810691f6b0c52c5bbe4caf61c3ee4' 
  AND token = '9A7IkLuNt+1TQQfZ765C1/Nj1FEHB5zTxB2NiccgGGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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