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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655b8c51f79eb998efb4a9de361887adcaa8df496755398a39955b6e4ade52ce' 
  AND token = 'LQaFZswmd89WCmYlDc4z8TJoCSC/iJB10Tjg0AYEN5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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