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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b399fcdb8f2ae85957005278269f928cac1b12dc51f512dde1a431db2e4ebc' 
  AND token = '6X6YF3QCK0VPnaCOHqBGAbFNJO895BQ1vSTtHvErmic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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