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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb2625beb52e3d9b47dedd5e507d96ec044edc57d4a45b5b4a4f3c16c717f0e' 
  AND token = 'WxhY8h0Y2ZhyrKanwXEI8+zTkuF/ABfBBNv5Mou2SS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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