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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bdaa71bdbabe4110f4df813dac11a7ec5a6d58c95b60902e2f24cacd802c78' 
  AND token = 'Lvh72NWkB2DfiEsFp87VZ/6e2NKtsq0Uy11nNf4AYis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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