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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd86261e435871af8a6d90ed6629768a241f4b333f71ca67b285a7355b645b8a' 
  AND token = 'jGb+LfesIG6/SyUKqMvglSR+0a72j3imumIiHe/U3qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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