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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be28e37db31d7c5efa2a28febd00af77b98004c2dfcb79cfed1ba53be6a2f47' 
  AND token = 'j4CSfT0ANcfEJoZKVvx8ZgYMfcHJQ+UmY//ZlZABJbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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