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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039971437aa7091f9699d7941ec08fb74eeb5b76e934f687b910bf1468b2a95b' 
  AND token = 'yXdKi63fAjrAUvt5xZvy4d52JxtNmGAHc6Ncu3qBmDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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