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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540916598a211ecf15f065cb9ffadab668f4b27a76c5549745aad63fc1370c66' 
  AND token = '8otJK+Rgxd61KnSf0b6FOr6nTu1JGGV+u5vVTfXur2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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