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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe97bdd536a60712faa6a42a21f28a5dd39777c77332be80bd3faba3ae907566' 
  AND token = 'sanEhDetDNbD3i6ioUiAQSfPiAJm09G+lVlgfchV530=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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