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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3287bdac1b61f11fedc6274ebf1cf0d2e81e4f89881c732b968b0bd3d144700' 
  AND token = 'Yha7OkBJDn7qYxRwD7Q34Twv1M9b2ikkZPqM3YXFchM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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