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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd0bb5eea35262c6ba0f3c10bf503c29ce8b10b5b0c4161d405759daeef166e' 
  AND token = '5tV+ySqog0MO78VXEPWlCZu1H+TkbHz5sayBOt0olhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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