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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1f65c0059e7c1a52d2ee2787d03f860c592464cde3c28f9852b60169a2eaed' 
  AND token = '3bPbuwFIxRgHX7QghexeI+9ySdoX+7PGSq/zLmxN6og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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