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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc17c2c5f4fbba88eb90a568b75b50dab694ece776a9403b44c63bb71a42487' 
  AND token = 'LBhS4c5qwi8raGSq1w9fhzagiCLNgrD7K9eNUdN6j0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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