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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc5db50fc7ae898db72076c9cfff40c705965f45c8231b248773baa8665f4c1' 
  AND token = 'hf5VFSsUcD1X7U38f91arFp3NUD3mxuhXMqu34Mbo2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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