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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fd2144bb5f81c748980b14ac622d83473b21530817c0205787fc4263b3bd21' 
  AND token = 'oVk3XbRD5/XVpTgSVNue7phW31hjFavyE1aOpXHzaYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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