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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99185004633bc4773fb69cabc49ce6c2ac921b7562634a283bb4dd172d76c46e' 
  AND token = '1PI7ovQ1mFq2j7B0FcInWgYH9prf92r4EYdYsyqmHUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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