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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ae736804763e7c4065efae9953284899d6bb79d3f5003d4d362d6d4c3d0458' 
  AND token = '39VO/T7pwdRO1KU9amwwwkK9kLlmrd39MIdF7adLwG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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