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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785b3e5f852cf79f1bb8769bc7d5606c7a925ad08c74d68df19b5cc5e736de6b' 
  AND token = 'sJjaLVzyj2riHIMLqkTaSDPeQOXJGJiBILqCW5IahSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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