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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc320ef124ffb8d0128e77b3b9d13fa10defb44b6d1ddce94b4821535709797c' 
  AND token = 'CtAQKeCh6DZkOGjJwfpbx5WW502Cxs4a5PlV7q1bUbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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