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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033cc618e2c25db0078d2f2b542a8d253e8f301cb63bf57bb6417166088f1a10' 
  AND token = 'WAwts2pyj4YEKJDZ45q4IKeZuWLUFA++GXX8QvamWCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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