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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a781cd59f696ea887d866b59049715e3f38057f2c7e05d50d765d501354559' 
  AND token = 'l/MtLEXPFFNs0U0WMMRRt/XxnIvaUpGzlEFuv8MpO9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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