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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8390a1a704acaf8e28602d82ba26555d18af45c8e07ea4e6db0742089f2d862a' 
  AND token = 'nslqKygqrIujAw215laBX11bEbca6IrThIT7kIjmExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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