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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3188c696b0be3bde7521d74eaad7559ea97342db27ff3689339589c99dfa8559' 
  AND token = '96ee7jNIs2VJIyiqgSxgrbefV/SRcxMnvgZkUKH8p3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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