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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4523050339671bd8a9830a5ed0caae0152335b328b652d6d79ec90993787b9bc' 
  AND token = 'HKbSJZHT3M5CBd+vTff1YN/uBwfhez4MbC7+yfRPfok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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