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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704166a93566e7a1fc74f4daeb90e7d5dd11d31c74634aa551ceb313c0e510a8' 
  AND token = 'tfAREr0476wUpP2EcIDXcjmPYI64b0V0xR3LC1GLtHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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