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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3623753115d63bbb50b0432b466ac85110ab8ae6cd98b2bc653e0598afb0205' 
  AND token = '58bCf2HTWyD2cK8n1t8kjGj37/XZZMomVCxOgxlz40k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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