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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537a5c4e4a0e7be2ed2aaedd83307fb0823c75ec6a8558ae2f31c5e44f12ab9f' 
  AND token = '+kkyL8dEc+TGrVj16u87LGzIDV3yJLjWr0jTg1YetNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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