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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fddc0c11f983e1cd960d1323d88dee4ae5e49af91347a5664b28d347ca6e03' 
  AND token = 'g3wiDx+Kk6B/Il0VX+Isp5OMq4bLrhAnFx72yU+A8sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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