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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b58d92d5c211b64af0a3026663c4e91e1f9f8b2168fc62943e873d87c3880af' 
  AND token = '3CH4lHIIzHmEK/ToJxdBoNOAvoawhxL2Dtvix8Onu+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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