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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb77d1a940d8f19b9f05497ec2ac56cf641e93f1d55402915a037c7473519701' 
  AND token = 'f9z1hU5B4eFZMaMmW8J9xRETL3GXwhCduPG4yfAloNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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