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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77487e35d676fe35582358f64729f5f3594b702e03a1ddf86cd0db8e24cb63b9' 
  AND token = 'DVMPAzSIcBOePhzZBCaNldyeiQVLQPWCOPMC+IU3whU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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