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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d824673fe4f29a3805669022bdd6a11d5548d5bd536f3496b813e329e485df1' 
  AND token = 'r+93j0RS3+SJOs+HEXt3gewLdVmfv6D/gxYWKfllNtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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