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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9705e8f1794f18a4bb6268361fbf8b4bef13a9254f3fbcf2f0202b5dd9eedf5' 
  AND token = '2r7nBNICtJVEokr33pFlVMQNIaAPZu0jj5T0udxHUW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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