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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0bc9a3b8ff9803f91745d95ab9c4af4e51bd7587c60c1b1da053430bc974e3' 
  AND token = 'xCAKeyexmuFcbGDpDF/o7T4SzhgL9cuR5mILB5MxaZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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