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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd8c1360735018813f0c070118037b15b38c782d2f195e930522e48f88290c1' 
  AND token = 'WiB3H2RYYdvGYAyBRfdD0Zj+U0wH9QP4gayUDHioY/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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