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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700197e355f6b2a3fe358643712ebd487bfe7ab4cb08ceac5d77759ab612a14c' 
  AND token = '/52qB6bD/RyoZRtS/fWZnKe8aFuOdspUVfKCWSuY1+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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