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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3847109adf4a7c1de78879613c047795d9bb598ca3da1a00b5d62b3b6736c39' 
  AND token = 'H0RnhxMc9htsVpxcwkJEUeFCiVR5OOR1KCEXX2dnS8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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